A131681 Phi(binomial(2*n,n)*n^2) (phi of A002736 = Apery numbers: n^2 C(2n,n). ).

0, 1, 8, 48, 384, 1440, 8640, 40320, 184320, 829440, 5529600, 18247680, 87588864, 474439680, 1532805120, 7664025600, 32699842560, 130288435200, 517321728000, 2184247296000, 9196830720000, 38626689024000, 188841590784000

Offset: 0

Author

Zerinvary Lajos, Oct 07 2007

Keywords

• nonn

Crossrefs

Cf. A002736.

Programs

Maple

with(numtheory):with(combinat):a:=n->phi(binomial(2*n,n)*n^2): seq(a(n), n=0..25);